Chint BH-0.66 30I 200/5
Description
Measuring heavy commercial switchboards without service interruption.
Chint DTSU666-CT is a high-precision Class 0.5S commercial three-phase smart energy meter engineered to interface with external 5 A secondary current transformers (from 100 A to thousands of amps), delivering sub-second RS485 Modbus telemetry for commercial zero-export control and industrial peak shaving.
Interfaces with External 5 A Secondary CTs
Measures commercial switchboards of any current capacity (from 100 A up to thousands of amps) using standard current transformers.
Class 0.5S Utility-Grade High Precision
High measurement precision for precise commercial demand management, power factor analysis, and sub-billing.
Bidirectional 4-Quadrant Energy Tracking
Tracks active and reactive energy import and export across all 3 phases in real time.
Universal Inverter Compatibility (Modbus RTU)
Pre-calibrated communication profile natively supported by SAJ, GoodWe, and major European commercial inverter brands.
More product details
Commercial main switchboards often carry 100 A to 1,000 A+ across thick copper busbars that cannot be severed for direct-feed meters. The DTSU666-CT interfaces with external split-core or solid-core current transformers.
- 1.5(6) A rated inputs accept secondary current from standard 5 A external CTs.
- Programmable CT ratio (e.g. 100/5 A, 400/5 A, 1000/5 A) configured directly via front keypad.
- Measures active energy, reactive energy, voltage, current, and power factor simultaneously.
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3 models
Accuracy class
Class C/ 0.5S
Class B/ 1.0
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Communication
Modbus-RTU
Modbus-RTU
RS485
Weight
0.33 kg (Approx.)
0.33 kg (Approx.)
200 g
Dimensions
72mm × 100mm × 65mm
72mm × 100mm × 65mm
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Sub-second zero-export closed-loop control with certified precision.
Sizing multi-inverter commercial zero-export systems requires tight synchronization between the meter and the plant controller (e.g., SAJ eManager-C1 Pro or GoodWe SEC1000). The DTSU666-CT provides high-speed telemetry. High-speed RS485 Modbus RTU interface broadcasts power metrics to inverters every few hundred milliseconds. Class 0.5S active energy accuracy ensures strict compliance with utility zero-export limits. Standard 35 mm DIN-rail mount (72 mm / 4U width) fits standard commercial distribution boards.
Ratios from 200/5 to 4000/5
A site that grows needs new transformers and a new number in the meter - not a new meter. The ratio is a programmable parameter from 1 to 9999, which is what lets one model serve the whole commercial range.
The same four modules as the direct meter
72 x 100 x 65 mm, 0.33 kg on 35 mm rail. A board already drawn around the direct DTSU666 takes the CT version without redrawing the layout.
RS485 Modbus-RTU, 9600 default
Bidirectional kWh and kvarh, kW, kvar and kVA, Irms, Vrms, frequency and power factor, at 1200 to 19200 bps. Under 2 W to run at 10 VA.
Technical data
Unlimited amperage scaling via external CTs engineered for commercial hybrid solar and microgrid telemetry.
Class 0.5S commercial three-phase smart meter for external current transformer integration.
Purpose-built for commercial facilities, multi-inverter solar plants, and heavy main service feeds exceeding 80 A, the DTSU666-CT connects to external 5 A secondary current transformers. With Class 0.5S high precision and bidirectional energy tracking, it enables large-scale zero-export regulation, factory peak shaving, and power quality monitoring.
- High Precision
- Class 0.5S
- External CTs
- 5 A Secondary
- Fast Telemetry
- < 1s
- Panel Integration
- DIN-Rail
Model & Type
- Brand
- Chint (Zhejiang Chint Instrument & Meter)
- Model
- DTSU666-CT
- Type
- Three-phase DIN-rail smart energy meter, external CT
- Connection
- 3P4W via 3× /5 A current transformers
- Accuracy
- Class C / 0.5S (with CTs)
Electrical
- Nominal voltage (V)
- 3×220/380 ... 3×240/415
- Operating range
- 0.8 Un ~ 1.15 Un
- Current input (A)
- 0.015 - 1.5(6), CT secondary
- Required CTs
- 3 × current transformers with /5 A secondary (not included)
- Frequency (Hz)
- 50 / 60
- Power consumption
- ≤ 2 W, 10 VA
Communication & Display
- Display
- 7-digit 7-segment display
- Interface
- RS485, Modbus-RTU
- Baud rate (bps)
- 1200 / 2400 / 4800 / 9600 (default) / 19200
- LED indication
- Pulse output
- Measured values
- Import/export kWh and kvarhkW, kvar, kVA · Irms, Vrms, frequency, power factor
Environment & Mechanics
- Operating temperature (°C)
- -25 ~ +55
- Storage temperature (°C)
- -40 ~ +70
- Relative humidity
- ≤ 95% RH, non-condensing
- Ingress protection
- IP20
- Mounting
- DIN rail, 35 mm
- Dimensions (W×H×D, mm)
- 72 × 100 × 65
- Weight (kg)
- 0.33
Project fit
Where this model fits.
Scenarios that show which projects the Chint DTSU666-CT belongs in, what to verify before quoting, and when another model is the better pick.
Project scenario
Commercial Facilities, Factories & Heavy Services (>80 A Main Breaker)
Commercial installations deploying SAJ CH3 or GoodWe ET 15–50 kW inverters where main service conductors exceed 80 A.
Pairs with split-core CTs (e.g. Chint BH-0.66 or MBS KBU series) to measure large commercial currents non-invasively.
What Linker confirms with you
- Confirm this model against the adjacent rating in the same family
Documents
Chint DTSU666-CT catalog (EN) Chint DTSU666 / DSSU666 user manual (EN) Chint DTSU666/DSSU666 Smart Meter User Manual ENProduct questions
What current transformers should be paired with the DTSU666-CT?
Any standard Class 0.5 or Class 1.0 CT with a 5 A secondary output (e.g. 200/5 A, 400/5 A, 800/5 A). The meter connects to standard xx/5 A current transformers (such as Chint BH-0.66-30I or MBS KBU-58 series). Installers configure the transformation ratio directly in the meter's setup menu.
System components
Required components
MBS KBU 58 split-core CT, pick the ratio matching site current
Item number: DLK-MBS-KBU58-400-5A
DTSU666-CT needs 3 external CTs with a 5 A secondary (not included with the meter): KBU 58 supplies that interface across six ratios. Not needed for the direct-connect DTSU666.